General > General Technical Chat
12V DC UPS
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Alex Eisenhut:
Gentlemen, this is EEVblog, not Twitter.
NiHaoMike:

--- Quote from: beanflying on July 27, 2022, 05:35:49 am ---Wow for one specific instance and size of YOUR choosing you 'allegedly' find and option to prove what exactly? Someone selling bulk single cell leftovers sourced from the factory floor in China is cheaper than someone selling a packaged 12V AGM Battery? This is a bogus argument Lithium is across the board more expensive than AGM this is just a simple fact.
--- End quote ---
For another example, 108 new Japanese 18650s for $100:
https://batteryhookup.com/products/new-case-of-108-panasonic-ncr18650a-2900mah-cells
In 3S configuration, you get 104Ah. There are cheaper 100Ah conventional lead acid but sealed lead acid is more expensive, even in that fairly large size.

--- Quote ---As to the second part of your attempted weasel it is not rocket science or hard to design a comparator to switch or reset the trigger of a micro to start and stop a charge process at certain over or under voltages. There you go it even has built in BMS  ::) eBay auction: #384879258895

--- End quote ---
That doesn't handle current limiting, so we go back to the idea of using a resistor for limiting current.
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